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Professor Stefan Węgrzyn was born on 20 May 1925 in Krakow. He began his higher education in 1944 in Lviv and continued it since 1945 at the Silesian University of Technology in Cracow (temporarily functioned within the Mining Academy now the AGH University of Science and Technology) and then in Gliwice. After graduation in 1949 until his death he worked at the Silesian University of Technology, passing through all stages of academic career to obtain the title of full professor in 1968.

Since his first book, published in 1949, "Operational calculus for the calculation of transients in electric circuits with lumped constants", Professor Węgrzyn took an active part in scientific life. This book was a result of his research performed as a student. This book was a basis of his lectures at the Electrical Engineering Faculty of the University.

In 1964 he was elected as a corresponding member of the Polish Academy of Sciences (PAS) and at that moment he was the youngest member of PAS. He became the full member of the Academy in 1973. Professor Węgrzyn was for many years a member of the Presidium of the Academy and the chairman of the Committee on Informatics of PAS, as well as a full member of the Polish Academy of Arts and Sciences.

From 1963 to 1969 he was Deputy Director for Science in Institute of Automation PAS in Warsaw. In 1968 he created the Department of Complex Control Systems PAS in Gliwice, which became the Institute of Theoretical and Applied Sciences PAS in 1989 and where he was the scientific head until 2006.

Professor Węgrzyn was a co-creator (1964) of the Faculty of Automatic Control (currently the Faculty of Automatic Control, Electronics and Computer Science) of Silesian University of Technology in Gliwice. Initially he was the head of the Chair of the Automatic Control Theory and later, during the years 1971 to 1995 he was director of the Institute of Informatics at the University.

He received a degree honoris causa from several universities in Poland (Silesian University of Technology in 1988, AGH University of Science and Technology, Cracow 1989, Rzeszow University of Technology, 2002), France (University of Lille, 1973) and Canada (Universite de Sherbrooke, 1977), and he was a laureate of numerous awards and honors.

Professor Węgrzyn was the chief editor of a journal 'Theoretical and Applied Informatics' since the release of the first paper at 1971 (at that time the quarterly was titled 'The Fundamentals of Control' changed later on 'Archives of Theoretical and Applied Informatics'). He took care not only for the publishing level by reading the most of articles by himself, but also tried to adapt the character of the journal to current trends in the domain of automation and informatics. He attached the great importance to practical aspects of scientific research what is excellently expressed by his personal choice of the title of the journal and the fact that he was a co-founder of five patents.

Professor Stefan Węgrzyn died on 28 July 2011. We lost a great scientist, an eminent teacher, a lecturer, a co-creator of Polish automation and informatics, a man who formed several generations of scientists and engineers in these areas.